The Penguin Dictionary of Botany - Stephen Blackmore, Elizabeth Tootill

This dictionary covers both the pure and the applied aspects of the subject and such related fields as agriculture and horticulture. Encyclopaedic in form and with an extensive cross-referencing system, it contains substantial articles on major terms and concepts as well as shorter articles, ranging from physiology to cell biology, microbiology to horticulture and genetics to plant pathology.